After Replacing Proximity Sensor, the Front Camera Becomes Blurry

I replaced my iPhone 6 front screen and the proximity sensor stopped working. After that, I tried changing my proximity sensor with a new one, which replaces the front camera as well. However, after changing it, everything works fine except that the front camera is blurry and unable to focus.

Are there smudges on the lens of the camera? Or did I not position it correctly in the camera socket?